ON ASSESSMENT OF SEVERAL FATIGUE LIFE PREDICTION METHODS

The main fatigue life prediction methods and models were reviewed and evaluated according to the relevant literatures and testing results. The biggest advantage of Miner rule is its methodology and philosophy for all of the structure,but its forecasts are dispersed and lack of precision,which limits its application.The relative Miner rule prediction accuracy is relatively high under certain conditions.Local strain method is already considering material nonlinearity,this method outperforms the Miner rule.Willenborg and Wheeler model are still in initial stage.It is difficult for crack propagation prediction method to solve many problems,such as three-dimensional crack closure characteristics.All methods described here both have their validities and limitations.So a correct method should be selected to meet the requirements of specific issues.